Pr

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Pr,

symbol for the element praseodymiumpraseodymium
[Gr., =green twin], metallic chemical element; symbol Pr; at. no. 59; at. wt. 140.90765; m.p. 931°C;; b.p. 3,512°C;; sp. gr. about 6.8; valence +3 or +4. Praseodymium is a soft, malleable, ductile, silver-yellow metal.
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Pr

(chemistry)

PR

On drawings, abbr. for “pair.”

PR

(1)

pr

(networking)
The country code for Puerto Rico.